of worcester



Aug. 13, 1929. A. J. CHEVRETTE 1,724,257

SIDE SLIPPING WEFT DETECTOR FOR LOOMS Filed Dec. 15, 1926 f 5 w 4? IIIII -D 42 INVENTOF? Au'ausfl N I CHEVEE-TTE an indication.

Patented Aug. 13, 1929.

UNITED STATES PATENT. OFFICE.

AUGUSTIII J'. CHEVRETTE, OF WORCESTER, MASSACHUSETTS, ASSIGNOR T CROMP-TON 82: KNOWLES LOOM "WORKS, OF WORCESTER, MASSACHUSETTS, A CORPORATIONOF MASSACHUSETTS.

SIDE- SLIPIPING WEFT DETECTOR 'FOR LOOMS.

Application filed December 13, 1926. Serial No.'154,407.

This invention, relates to improvements in loom weft detectors moreespecially tothe side slipping type, and it is the principal object ofthe invention to prov de a detector which will not give a falseindication of exhaustion if brought in contact w1t h a con,- .icalportion of the yarn of a bobbm.

ft is common practice in many IIllllS to wind the yarn on the bobbins sothat a conical surface is presented between the body of the yarn and thebutt of the bobbin. When the usual side slipping detector is employed itcannot ordinarily be used so as to slide toward the butt of the bobbin1n order to give indication because of the fact that the conical surfaceof the yarn aids the lateral movement of the detector and causes thelatter to give a premature indication. 0n the other hand, when the weftis almost depleted it may have a conical surface which tapers toward thebobbin tip, and if the side slipping detector moves toward the tip toindicate, the conical surface'of yarn may cause the detector to slip andgive too early it is an important object of my present invention toprovide a pairof oppositively moving side slipping weft detectorsarranged to operate correctly independently of the conical form of theyarn wound on the. bobbin.

It is a more particular object of my invention to provide a sideslipping weft detector mounted on a longitudinally movable carrier heldagainst improper angular motion by the 'controller for the actuatorwhich initiates a change in the operation of the loom, as replenishment.

It is a still further object of my invention to provide a pair of sideslipping detectors, each having its own center of rotation, the centersbeing spaced so as to provide a sufficient angle between each detectingsurface without necessitating lengthening of the slot in the front wallof the shuttle through which the detector normally projects on detectingbeat-s of the loom.

It is a more particular object of my invention to provide a pair of sideslipping weft detectors formed alike but with parts so related that thedetectors may be inverted one with respect to the other withoutinterference and yet have the yarn engaging surfaces in horizontalalignment.

\Vith these and otherobjects which will appear as the descriptionproceeds, my invention relates to the arrangements and combinations ofparts hereinafter set forth, and more particularly pointed out in theclaims.

In the accompanying drawings wherein. a

convenient embodiment of my invention is shown:

Fig. l is a top plan view of my weft detector, parts being in sectionand the detec- 4, Fig. 1,

Fig. 5 is a vertical section on an enlarged scale on line 5-5 of Fig. 1,

Fig. 6 is a perspective view of one of the detecting elements, and

Figs. 7 and 8 are diagrammatic views showing the relation of thedetectors and full and respectively. 7,

Referring to the drawings, the loom frame 10 supports foot 11 of a weftreplenishing mechanism more particularly though not necessarily of themulti-color type. Secured to the loom frame is a bracket 12 having anupstanding horn 13 provided with a longitudinal bore let in which isslidably mounted a controller pin 15. A block 16 reciprocat-esvertically in a guide 17 rigid with the bracket 12 and has pivotedthereon an actuator lever 18 one end of which moves vertically in a slot19 in horn 13 transverse to the bore 14. The left end of the actuator isconnected to an upwardly extending link 20. The block 16is given adownward movement on each detectingbeat of the loom when the lay is inits extreme substantially empty bobbins,

forward position and the controller 15 normally lies under the actuatorlever 18.

The transferrer mechanism comprises an arm of the usual form havingdepending fingers 22 which support the lay engaging latch, not shown, bymeans of which the transferrer is brought downwardly on transferringbeats.

' troller pin 15; the latter being held in The detector supporting meansincludes a stud 23 secured to the stand 12 and hav 35; mounted thereonfor limited angular mot a bed 24, said bed being held yieldinglydownward position by a spring 25 i posed between the bottom of said bedand fixed part of the bracket 12. An adjust: stop screw 26 limitsdownward motion or the bed and alfords means for var i vertical positionof the detector. Ti ter thus far described, with the excep theparticular form of the controller 15, i of common construction and formsno par of my present invention, being sub dantiall the same as thecorresponding parts as forth in patent to Ryon :ljchOZ-EOfilEi.

My invention relates more particula l to the bobbin engaging" portion ofthe do" or and the devices operated therein, a d in carrying myinvention into eiiect i provide the bed 24 with a pair of spacedupwardly extending bearings 30 through which e tends a detector carrier31 which may be formed of tubular or solid stock, preferably circular incross section. A collar 32 is secured adjustably to the carrier 31 byscrew 33, said collar being located the bearings and receiving thethrust of a compression spring the r bearing 30. The carrier 31 projectwardly from the forward bearing an; extended therethrough the bent endrelatively to the carrier by screw this construction it will be seenthat l troller wire 15 prevents angular mo of the sliding carrier 31because of the that the end of the controller which e the bore 14 is toone side of the center or tors to be described hereinafter e alw smaintained in proper angular pOSlilOD With respect to the bobbin beingdemetedv The means for withdrawing the detector on transferring beats ofthe loom comprises a wire 36 secured to the upper part of C; 32 by screw37, said wire extending wardly over the carrier 31 and then to the leftas at 38 in Figs. 1 and 3 to be in front of one of the fingers 22. Asthe latter moves forward at the time of transfe" the ca rier is advancedand the controller pin moved from under the lever 18 and the d tectingelements about to be described are withdrawn from the path of theincoming bobbin.

That portion of the detecting element which has direct engagement withthe surface to be detected comprises a pair of side slipping elements,each moving about an independent center fixed on carrier 31.itef-erring-to Figs. 1, d and 5 it will be seen that have broadened therear end thereof so to have lateral extensions 41. The detector elementsare substantially the same, one of which is shown at d2 in Fig. 6. Eachdetector is formed preferably, though not necessarily, of sheet metaland has a horizontal body portion a3 and a vertically extendingroughened yarn engaging portion M on the rear end thereon, while theforward end is bent back on itself as at a5 and has aligned openings 46.A pivot pin i? is secured in the plate 40 and passes through the alignedopenings 46, forming a pivot for the detector. Both detecting elemen sare the same, but in assembling i find it advantageous to have thehorizontal portion 43 of one of the detectors extend from the undersideof the plate 40 and a horizontal pornoof the other detector extend fromthe upper side of said plate, the purpose being to avoid interferencebetween said portions 4:23 a d to permit free and uninterrupted swingingof the detectors about their piv The height of the yarn engaging portionsuch that both detecting surfaces are in substantial horizontal aignment.

in order to hold the detectors yieldingly in the full line positionshown in Fig. 1, there are provided a pair of springs i3, one for eachdetector, said springs being interposed between prongs 49 on the carrieran the detectors hold the latter yieldin in nonial posit-ion. Thesesprings are indcpe dent of each other and permit each de tector to moveindependently of tin. thcr.

Under normal conditions, when a suineient supply of weft is present, theteeth of the vertical portions of the detectors will be embedded in theyarn of the surface to be detected and a swinging movement of saiddetectors will be prevented, the lay moving the carrier forwardlyagainst the action of spring to move the controller from under theactuator 18. The latter will therefore move downwardly withoutinterruption and the link 20 will remain at rest. lVhen insuilicientweft for continued weaving is present, however, the detecting elements42 will slide along the bobbin B to the position shown in dotted linesin Fig. 1, the carrier 31 and controller 15 remaining at rest so thatthe downward movement of the i "ht hand end of actuator 18 isinterrupted mus requiring the link 20 to be depressed to initiatereplenishment as set forth in Patent #1,O30,7 l8. v

As shown in Fig. 7 one of the detectors aligned with the conical part ofthe bobbin and would slide to the left, but the other detector engagesthe cylindrical body of the yarn and false indication is prevented.Also, in Fig. 8, oneof the detectors is aligned with the conical part ofa small bunch of yarn, but the angle is reversed from the previouscondition and the detector is held against a false indicating movement.The detectors must both move to indicate and this movement does notoccur until the yarn is'almost depleted.

A further feature of my invention relates to the fact that the detectingelement may be inverted so as to assume a different angular positionwith respect to the bobbin. By disconnecting the controller andloosening the screw 33 the tubular carrier 31 can, be turned through 180relatively to the stand or support 30. .This will permit the detectingelement to be given a different set ting relatively to the fixedsetting.

From the foregoing it will be seen that I have provided a very delicateform of weft detector having a pair of oppositively moving detectingelements, at least one of which must have direct engagement with thesurface to be detected oneach detecting heat of the loom. If the bobbinbe formed so that the detector extending to the left is out ofengagement with the bobbin, the detector extending to the right willnevertheless engage the yarn and being restrained will move forwardly toprevent indication of weft eXhanstion. If, on the other hand, asexhaustion approaches, the bunch of yarn remaining on the bobbin istapered toward the right to engage the detector extending to the left,but not the one extending to the right, indication will likewise beprevented. It will be seen that it is necessary for both detectors to befree to move and that a conical surface of yarn opposite either detectorwill not .cause indication, although if one detector alone were used afalse indication might result. detectors are identical in constructionbut are so formed that they can be reversed, one

above and the other below the plate a0 and that the yarn engaginsurfaces are disposed as to be in the same horizontal plane. It will.also be noted that the controller wire 15 serves to hold the carrier Bland the detecting elements in proper angular position.

Having thus described my invention it will be apparent that changes andmodifications may be made therein by those skilled in the art withoutdeparting from the spirit and scope of the invention, and I do not wishto be limited to the details herein disclosed but what I claim is:

1. In a weft detecting mechanism for looms, a carrier yieldably held indetecting position, and a pair of substantially similar detectingelements, a pivotal connection on the carrier for each element, eachelement having a yarn engaging surface and the pair of yarn engagingsurfaces being in substantially horizontal alignment, each elementhaving a portion to cooperate with the pivot of the carrier and havingconnecting means between the yarn engaging and pivoting per tions, saidelements being one reversed with respect to the other so that the yarnengaging Furthermore, it will be seen that theand pivoting portions maylie in" substan tially the same planes but the connecting portions willlie in different planes to avoid interference between the movements ofthe detecting elements.

In a weft detecting mechanism for looms, a fixed support, a carrierrotatably mounted in the support to. assume two dilfer ent angularpositions relatively to the support, said carrier being slidably mountedin the. stand to move in a direction toward and from the surface beingdetected and a detector element pivoted on the carrier and having adetecting surface offset from the axis of the carrier, said detectingsurface to be operatively disposed todetect for weft presence when thecarrier is in eitherangular position relatively to the support.

3. In a weft detecting mechanism for looms, a stand, a carrier mountedin the stand for rotation relatively to said stand, said. carrier beingslidably mounted in the stand to move in a direction toward and from thesurfacebeing detected a pair of detectors moving in opposite directionsand each having a detecting surface, said carrier capable of assumingtwo angular positions relatively to the stand so that the line join: ingthe detecting surfaces may assume two positions relatively to thesurface being detected. I

4. In a weft detecting 'mechanism for looms, a stand, a carrier mountedin the stand for rotation relatively to said stand, said carrier beingslidably mounted in the stand to move in a direction toward and from thesurfacebeing detected, a detecting element. movably mounted on thecarrier,

said carrier and element being movable relatively to the. stand toassume two angular positions with respect thereto, and loom controllermeans operatively related to the carrier to hold the latter againstangular move-- ment relatively to the stand in whichever angularposition the carrier may be relatively to the stand.

5. In a weft detecting mechanism for looms, a stand, a carrier mountedin the stand for rotation relatively to said stand, said carrier beingslidably mounted in the stand to move in a direction toward and from thesurface being detected, a weft detector pivotally mounted on the carrierto move in a plane substantially parallel to the axis of the carrier,said carrier capable of assuming two dilferentangular positionsrelatively to the stand in each of which the detector is disposed foroperative detecting coaction with the surface to be detected, andcontrolling means for the loom to hold the carrier in either of itsangular positions relatively to the stand.

6. In a weft detecting mechanism for looms, a stand, a carrier mountedin the stand for rotating relatively to said stand,

lOO

said carrier being slidably mounted in the stand to move in a directiontoward and from the surfacebeing detected, a weft detector pivotallymounted on the carrier to move in a plane substantially parallel to theaxis of the carrier, said carrier capable of assuming two differentangular positions relatively to the stand in each of which the detectoris disposed for operative detecting coaction with the surface to bedetected, controlling means for the loom to hold the carrier in eitherof its angular positions relatively to the stand, and a guide for thecontroller fixed relatively to the stand.

7. A detecting element for a weft detecting mechanism comprising asubstantiall flat body portion, a yarn engaging detecting portionextending from one side of the flat body portion in adirectionsubstantially perpendicular to the flat body portion, and paidelement also having at the end thereof opposite the detector portionanother portion extending from the flat body on the same side thereof asthe detector portion and having provision to receive a pivotal support.

In a weft detector for a loom having a lay and a surface to be detected,a support held in fixed position, a carrier rotatably mounted in thesupport to assitin'ie two different angular positions relatively to thesupport, a pair of side slipping weft detectors, a pivot for saiddetectors mounted on the carrier, each detector having a detectingsurface offset with respect to the pivot, the carrier and detectorsmoving forwardly and rearwardly in a line substantially perpendicular tothe axis of the surface being detected, said detectors at exhaustion ofweft moving transversely of the axis of the carrier and along and incontact with a denuded bobbin, said detectors being also capable ofdetecting weft presence in either angular position relatively to thesupport.

9. In a weft detector for a loom having a lay and a surface to bedetected, a support held in fixed position, a carrier rotatably mountedin the support to assume different angular positions relatively to thesupport, a

pair of side slipping weft detectors, a pivot for said detectorsmountedon the carrier, each detector having a detecting surface off set withrespect to the pivot, the carrier and detector moving forwardly andrearwardly in a line; substantially perpendicular to the axis of thesurface being detected, said detectors at exhaustion of Weft movingtransversely of the axis of the carrier and along and in contact with adenuded bobbin, said detectors being also capable of detecting weftpresence in any angular position relatively to the support, controllingmeans for the loom to hold the carrier in any of its angular positionsrelatively to the stand, and a guide for the controller fixed relativelyto the stand.

10. In a weft detector for a loom having a lay and a surface to bedetected, a sup-port held in fixed position, a carrier rotatably mountedin the support to assume a plurality of different angular positionsrelatively to tae support, a pair of side slipping weft detectors, apivot for said detector mounted. on the carrier, each detector having adetecting surface offset with respect to the pivot, the carrier anddetector moving forwardly and rearwardly in a line substantially per'iendicular to the bein detected, saiddetectors at exhaustion of weftmoving transversely of the axis of the carrier and along and in contactwith a denuded bobbin, said detectors being also capable of detectingweft presence in any angular position relatively to the support, andcontrolling means for the loom to hold the carrier in either of itsangular positions relatively to the stand.

In testimony whereof I have hereunto affixed my signature.

AUGUSTIN J. CHEVRETTE.

